310 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
colored, drying brown, oval, about 2.5 mm. long, strongly plano-convex, the 
sterile lemma at maturity finely undulate inside the slightly raised margin; 
fruit dark brown, shining. 
Open slopes, banks, and savannas, mostly moist soil, southeastern United 
States to Argentina; throughout the West Indies except Bermuda and the 
Bahamas. Originally described from Georgia and Florida; Paspalum undula- 
tum described from Porto Rico, and P. antillense from Guadeloupe. 
15. Paspalum olivaceum sp, nov. 
A leafy annual, olivaceous when dry; culms glabrous, slightly fleshy, com- 
pressed-striate when dry, 40 to 60 cm. long, ascending from a decumbent base, 
often rooting at the lower nodes, finally bearing simple floriferous branches: 
sheaths loose, thin, compressed, glabrous; ligule membrunaceous, erose, 1.5 to 
2mm. long; blades lax, erect, at least at the base, flat, or folded at base, com- 
monly 10 to 15 cm. long, 6 to 10 mm. wide, usually pilose on the upper surface 
at base, otherwise glabrous; panicle short-exserted from the bladeless upper 
sheath, the slender subflexuous axis 4 to 7 mm. long; rucemes 8 to 7, arcuate- 
spreading, 2 to 3.5 cm. long, the rachis scarcely 1 mm. wide, a few long hairs 
at the base; spikelets mostly in pairs, 2 mm. long, 1.5 mm. wide, obovate, 
strongly convex on the back; glume and sterile lemma equal, 5-nerved, thin 
and commonly torn, glabrous or the glume obscurely strigose, the lemma often 
minutely wrinkled inside the slightly raised margin; fruit dark brown, shin- 
ing, obovate-hemispherical. 
Type in U. 8. National Herbarium, no. 559837, collected in the island of 
Guadeloupe, September 23, 1897, by Pére Duss (no. 3915). 
Paspalum olivaceum is one of the group of brown-fruited annuals to which 
P. boscianum belongs. Because of its wrinkled sterile lemma it looks like a 
small lax-leaved P. plicatulum, from which species it differs in its branching 
culms and smaller spikelets and in being an annual. No habitat is given on 
the labels of the specimens, but the species is, probably, like its allies, found 
along ditches and in wet clay ground. Guadeloupe, Martinique, and the 
Guianas. 
16. Paspalum wrightii sp. nov. 
A glabrous perennial, the culms 1.5 meters or more long, simple, decumbent or 
floating at the base, with rootlets at the distant nodes, lush, with loose over- 
lapping sheaths, the upper sheaths close, elongate; ligule membranaceous, 1 
mm. long; blades suberect, rather firm, 20 to 40 cm. long, about 5 mm. wide 
(the uppermost greatly reduced), involute toward the summit, scabrous on 
the margins and bearing a tuft of long hairs just back of the ligule; racemes 
5 or 6, ascending, 4 to 6 cm. long, the common axis slender, 8 to 10 em. long, 
not hairy in the axils or with one or two hairs only; rachis 1.5 mm. wide, 
glabrous, the margin minutely scabrous; spikelets in pairs, closely imbricate, 
2.2 to 2.5 mm. long, about 1.4 mm. wide, elliptic to slightly obovate, glabrous, 
the glume and sterile lemma equal, thin, slightly and irregularly wrinkled, 
3-nerved or with un additional obscure pair near the margin; fruit about 2.2 
mm. long, 1.2 mm. wide, elliptic, chestnut-brown, the rolled margins of the 
lemma pale. 
Type in the U. S. National Herbarium, no. 865562, collected in Cuba by: 
Charles Wright (no. 3843). 
Apparently an aquatic or semiaquatic and probably allicd to Paspalum plica- 
tulum. Known only from the type collection, on which is given no date and 
no locality other than Cuba. The floating habit is inferred from the texture 
of the lower part of the culm and its loose slightly infiated sheaths. In the 
